Material applicable for valve-packing or other purposes.



llirn STATES ARTHUR NIXON, OF MANCHESTER, ENGLAND.

MATERIAL APPLICABLE FOR VALVE-PACKING OR OTHER PURPOSES.

SPECIFICATION forming part of Letters Patent No. 674,872, dated May 28,1901.

Application filed efiember 3, 1900.

To to whom, it ntrty concern:

Be it known that I, ARTHUR NIXON, a subject of the Queen ofGreatBritain, and a resident of Manchester, in the county of Lancaster,England, have invented certain new and useful Improvements in MaterialApplicable for Valve-Packin g or other Purposes, of which the followingis a specification.

This invention relates to the manufacture of packing applicable forvalves, pistons, pipe-joints, washers, and for other purposes.

It consists, essentially, of a composition comprising black sulfid ofantimony, asbestos powder, and rubber dough thoroughly mixed andincorporated together and then vulcanized.

In carrying out theinvention the black sulfid of antimony and asbestosare separately ground or reduced to a fine state of subdivision and arethen intimately mixed togetherin the proper proportions. The mixing maytake place in a grinding-machine, either in a dry or wet state, or inany suitable form of mixing-machine. The rubber dough is also preparedin the usual Way and the mixture of the black sulfid of antimony andasbestos is incorporated therewith in the desired proportions. Thefollowing proportions have been found to give very satisfactory results,Viz: black sulfid of antimony, four pounds; asbestos powder, six pounds;rubber dough, ninety pounds; total, one hundred pounds. It is to beunderstood that these proportions may be Serial No. 387431. (Nospecimens.)

varied as may be found desirable for various purposes. To increase thehardness or brittleness of the material the proportion of the rubberdough may be reduced, and to render it more pliable the proportion ofthe asbestos or rubber dough may be increased.

The composition is molded to shape in suitable molds such as disks,rings, plugs, bars, or other desired shapeor may be rolled or spreadinto sheets of any desired size and thickness and is then treated in avuleanizing-oven in the Way customary with rubber goods of this class.

What I claim as my invention, and desire to protect by Letters Patent,is

1. A composition applicable for valve-packing and other purposescomprising black sulfid of antimony, asbestos powder, and rubber doughin suitable proportions substantially as described.

2. In a composition applicable for valvepacking and other purposes, thecombination with asbestos and rubber dough, of a suitable proportion ofblack sulfid of antimony substantially as described.

In Witness whereof I have hereunto signed my name, in the presence oftWo subscribing witnesses, this 22d day of November, 1900.

ARTHUR NIXON.

Witnesses:

J. OWDEN OBRIEN, HARRY BARNFATHER.

